Skip to content

Course home

Simple phenomena of magnetism

Simple phenomena of magnetism

EasyMedium
1234567891011121314151617181920
Question 11

A student wants to demagnetise a permanent steel bar magnet. They design four different experimental procedures involving a solenoid:

  • Procedure 1: The magnet is placed inside a solenoid connected to an alternating current (a.c.) supply, and then the magnet is slowly withdrawn until it is far away from the solenoid.
  • Procedure 2: The magnet is placed inside a solenoid connected to a direct current (d.c.) supply, and then the magnet is slowly withdrawn until it is far away from the solenoid.
  • Procedure 3: The magnet is placed inside a solenoid connected to an alternating current (a.c.) supply, and the current in the solenoid is slowly reduced to zero using a variable resistor.
  • Procedure 4: The magnet is placed inside a solenoid connected to a direct current (d.c.) supply, and the current in the solenoid is slowly reduced to zero using a variable resistor.

In which of these procedures is the magnet successfully demagnetised?

A

1 and 2

B

1 and 3

C

2 and 4

D

3 and 4

Markscheme

Simple phenomena of magnetism Questions

  1. IGCSE
  2. /Physics
  3. /Simple phenomena of magnetism

169 exam-style questions on CIE IGCSE Physics Simple phenomena of magnetism, covering Simple phenomena of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank